(0853) Complementאֵת'eth{ayth}Apparently contracted from H0226 in the demonstrative sense of entity; properly self (but generally used to point out more definitely the object of a verb or preposition, even or namely).

{0376} Primeאִישׁ'iysh{eesh}Contracted for H0582 (or perhaps rather from an unused root meaning to be extant); a man as an individual or a male person; often used as an adjunct to a more definite term (and in such cases frequently not expressed in translation.).

(5704) Complementעַד`ad{ad}Properly the same as H5703 (used as a preposition, adverb or conjugation; especially with a preposition); as far (or long, or much) as, whether of space (even unto) or time (during, while, until) or degree (equally with).

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Leviticus 15:18

A man  Or, The man, that had such an issue, which is plainly to be understood out of the whole context. For though in some special cases relating to the worship of God, men were to forbear the use of the marriage  bed, yet to affirm that the use of it in other cases did generally defile the persons, and make them unclean till even, is contrary to the whole current of scripture, which affirms the marriage  bed to be undefiled, Hebrews 13:4, to the practice of the Jews, which is a good comment upon their own laws, and to the light of nature and reason.

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the woman:

Leviticus 15:5 And whosoever toucheth his bed shall wash his clothes, and bathe [himself] in water, and be unclean until the even.Ephesians 4:17-19 This I say therefore, and testifyin the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind, ... Who being past feeling have given themselves over unto lasciviousness, to work all uncleanness with greediness.Ephesians 5:3-11 But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints; ... And have no fellowship with the unfruitfulworks of darkness, but rather reprove [them].2 Timothy 2:22Flee also youthful lusts: but follow righteousness, faith, charity, peace, with them that call on the Lord out of a pure heart.1 Peter 2:11 Dearly beloved, I beseech [you] as strangers and pilgrims, abstain from fleshly lusts, which war against the soul;

unclean:

Exodus 19:15 And he said unto the people, Be ready against the third day: come not at [your] wives.1 Samuel 21:4-5 And the priest answered David, and said, [There is] no common bread under mine hand, but there is hallowed bread; if the young men have kept themselves at least from women. ... And David answered the priest, and said unto him, Of a truth women [have been] kept from us about these three days, since I came out, and the vessels of the young men are holy, and [the bread is] in a manner common, yea, though it were sanctified this day in the vessel.Psalms 51:5 Behold, I was shapen in iniquity; and in sin did my mother conceive me.1 Corinthians 6:12 All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.1 Corinthians 6:18Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.1 Thessalonians 4:3-5 For this is the will of God, [even] your sanctification, that ye should abstain from fornication: ... Not in the lust of concupiscence, even as the Gentiles which know not God:Hebrews 13:4Marriage [is] honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.